Re: Case 1840 - Installing Hydraulic Motor

When I slacken the -16 hose connections between the Variable Displacement Pump and the Hydraulic Motor, there's oil all over the place coming out, but the flow rate does not seem to change with control inputs.

My pump has also an internal Charge Pump that is producing about 120 psi that I measured the "M3" port. From there it goes thru a orifice and on to the Manual Control Valve. It then, depending on the valve position, exits via one of two paths and on to the Servo at the Variable Displacement Pump. One path move moves the Servo (& swash plate) one way while the other path drains; & vice versa.

I measured the pressures at the "M4" and "M5" ports, which are the two paths to the Servo. NO PRESSURE in either one; just a little dribble out.

So I now suspect a plugged orifice, or that the Manual Control Valve is not letting the oil thru to the Servo. The 1/8 NPT plug over the orifice is stucker that stuck so I'm working up the courage to open up the MC Valve.

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